The Snack:[]
Many games can get a huge boost to replayability by altering, rearranging, or completely regenerating the map each time a new game is loaded. One of the reasons players might become bored with a game could be they are too familiar with it: they know exactly where they need to go and what they need to do. There's no more variety, no more mystery. Introducing a new level layout or map on each playthrough can be a great solution to this problem.
Example 1:[]
In Age of Empires, there is a good random map generator which can create an unique map for players. The players also can decide what kind of map they want to create such as black forest or desert.
Example 2:[]
In Sid Meir's Civilization franchise, the world the player must conquer is randomly generated on each playthrough. Not only does this intrigue the player, but it actually effects the way they will play each game. As they explore the map, they may discover enemies sooner or later, or find they are isolated on their own island. The excitement of exploring a new world each time they play can keep players coming back time and again.
Example 3:[]
Faster than light regenerate random game world every single time players start a new game, which makes it impossible for players to know what invent awaits them in the next sector. Players can pick the best approach to their goal, and always have to be prepared before they go forward. In this way, player would have a different game play experience every time they play the game.
Example 4:[]
In survival Minecraft, the biome you start in and the biomes that are directly adjacent to where you start is so crucial to how you play the game and what resources you value and stockpile.Due to how large an effect it has on gameplay many players will start multiple games, each starting in a different biome to see how they must change there survival strategy to each randomly generated environment. This is clearly showing an increase in replayability by using procedurally generated environments and maps.
Example 5:[]
Binding of Issac is infamous for its utilization of random elements. The maps are randomly generated from a pool of hundreds of different rooms and even provides the player random items. The playthroughs always feel unique and the interactions between the random items can make for some rather interesting results!